Phenomenon analysis when Autowired annotation is used for list

1、 The phenomenon

In a processing chain , There are many. AbstractHandler, One is the collection of management processing chains CompositeHandler.Handler1,Handler2, CompositeHandler yes AbstractHandler Implementation class of . among CompositeHandler Implemented as a

@Component
@Slf4j
public class CompositeHandler extends AbstractHandler {

	@Autowired
	private List<AbstractHandler> handlers;
	
	@Override
	public int handlerOrder() {
		// TODO Auto-generated method stub
		return 0;
	}
	
	@PostConstruct
	public void init() {
		log.info("handlers:{}", handlers);
	}

  Log output handlers Only 2 individual , Namely Handler1, Handler2. Why is this phenomenon ？

2、 analysis

DefaultListableBeanFactory Resolving dependencies List when , Obtain candidates that meet the specified type beanNames, Will filter with the current beanName equal .